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Old 06-11-2014, 05:36 AM   #1
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black water smells thor ace 29.2

have a a black water smell inside motorhome and outside. outside seems to be at black water holding tank.problem is i cant find it. no visible leaks anywhere and mastieatior hose seems ok .toilet is holding water in bowl so i dont think the smell can go thru water. Hoping someone has similiar problems and might have a fix. tks in advance. fred.
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Old 06-11-2014, 05:41 AM   #2
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Sounds like a venting problem...your tanks are vented up through the roof just like a house
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Old 06-11-2014, 08:36 AM   #3
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It could be your gray tank, too. It can smell pretty bad.

Check to be sure you have run a little water through all your sink and shower drains. Whenever we get that smell in our Mandalay, I have to run the washing machine through a short cycle. The washer P-trap will empty after a period of time, allowing tank vapors into the house. After running the washer, all is well again.


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Old 06-11-2014, 08:42 AM   #4
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Look under sinks, "might" have an internal vent. Should stay closed but sometimes they allow gasses in the living quarters.

Also, those vents that installs on the vent pipes on the roof. They suck out air, or give the tank a neg. pressure wen driving down the road. We installed one on the black tank & it helped quite abit.

(*#&(*# seal on our toilet not sealing! I tried cleaning real good with the bruch & poured boiling water in the toilet to help the seal seal but still not holding water.
I might need to replace the seal!
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Old 06-12-2014, 01:07 PM   #5
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Originally Posted by Rich-n-Linda View Post
It could be your gray tank, too. It can smell pretty bad.
Check to be sure you have run a little water through all your sink and shower drains. Whenever we get that smell in our Mandalay, I have to run the washing machine through a short cycle. The washer P-trap will empty after a period of time, allowing tank vapors into the house. After running the washer, all is well again.
Rich & Linda
Ditto. Also have had the grey water (when tank was near full) push its way thru the p-trap while driving down the road. The sloshing around while driving would force its way up the sink drain. Could not figure it out until I had the wife drive and then I could hear/see it happen.
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Old 06-12-2014, 01:14 PM   #6
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Originally Posted by thor ace View Post
have a a black water smell inside motorhome and outside. outside seems to be at black water holding tank.problem is i cant find it. no visible leaks anywhere and mastieatior hose seems ok .toilet is holding water in bowl so i dont think the smell can go thru water. Hoping someone has similiar problems and might have a fix. tks in advance. fred.
there is a THOR forum here: Thor Industries Owner's Forum - iRV2 Forums
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